Press the start button on dryer, it hums but wont turn. With 2 people pressed the start button again, held the door switch, reached in turned the drum, it hummed stopped humming then no more nothing. Kenmore 90 series dryer 1999.

might need a new starting capicater

First, check the door switch. Push and release it by hand and you should hear a click. If no sound, replace the door switch with this part.
If the switch is ok, press the cancel button on the machine. Then do this. press and hold the start button for 2 seconds then release wait 2 seconds and press and hold again for 2 seconds continue this pattern until the dryer goes into test mode. You will see all the lights on the control light up. press each button on the control one at a time 3 times each. (Do not press the cancel button) until the dryer begins to run. When the dryer starts to run then press the cancel button. Then your machine should function properly.

That is a bad sign. If the buzzing starts when you press the start button and stops when you release its almost safe to say that the motor has a dead short or grounded out and causing that to happen. You can check the start switch by getting a multimeter and with the dryer unplugged take the wires off the switch, place a lead on each pin and press the start with meter set for continuity. If it shows continuity when presed and stops when released your motor is shot and needs to be replaced.
Now if you press the start button and the machine starts to hum and continues to hum its possible that something has gotten caught in the blower wheel and binding the motor up. Depending on the make and model the location and access to it vaaries.
If you can turn the drum and then the dryer starts you have a bad motor. The way the dryer works is when you initially push the start button, electricity is sent to the start winding, or stator, of the motor. This will in turn start the motor turning. From there the stator will drop out of the electrical process and at the same time the run winding, or rotor, will take over and the motor will continie to run. Your stator is damaged, has a burn spot, etc so by you turning the drum, the belt around the drum is moved which is attached to the motor pulley. You basically take the place of the stator. Long story short, you have a bad motor.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/jason_4570d45317834dd3

http://www.partselect.com/dryer+dryer-wont-start+repair.htm

Belt probably broke

you have a problem with a component called a capacitor.the capacitor stores an electric charge.this charge gives the motor the "kick" needs to start.if you have a faulty one the motor will hum because it cant turn.it should only be replaced by a competent appliance technician.

Sounds like the motor is cutting out on its thermal fuse. The only cure is to change the motor.

When I push the start button it would hum if I hold the button to long and then it would cut off.

hi thats a sign of a faulty motor . replace the motor thanks the appliance doc.

no problem with motor or control board. fault is with the motor capacitor only. this is often attached to the motor or near it. the value of the capacitor will be printed on it (usually about 8uf) and you should be able to source from an electrical spares shop